Nautical publications are official editions assigned along with nautical and reference charts to provide mariners with navigational and hydrographic, hydrometeorological, astronomical and other necessary data, as well as international legal and reference information in order to maintain navigation.

Numbering system of technical publications is based on the principle of classification by purpose, thereafter all issued publications should be divided into nine classes as follows:

No. of class	No. of publications in the class	Classification by purpose
1	101-199	Sailing directions
2	201-299	Lights and beacons
3	301-399	Radio aids to navigation
4	401-499	Guides for navigation
5	501-599	Reserve group
6	601-699	Hydrometeorological atlases, charts, tables
7	701-799	Catalogues
8	801-899	Localization tablesbased on radionavigation systems
9	901-999	Position, recommendations, standards, reference editions

Account number is assigned to each documentation form and consists of capital Latin letters which are initial letters of English terms indicating scope of application, followed by Roman numeral number indicating serial number in the class (scope of application). Scopes of application of technical documentation forms:

Latin letter	Scope of application (Ukrainian term)	Scope of application (English term)
N	Навігація	Navigation
G	Геодезія	Geodesy
Н	Гідрографія	Hydrography
AN	Засоби навігаційного обладнання	Aids to navigation
НМ	Гідрометеорологія	Hydrometeorology

In order to register information, the appropriate blank form is established for a document itemized under permanent No. in the scope of application, e.g. AN-26: capital letters indicate the scope of application - Aids to Navigation; number 26 marks serial number in the class (scope of application). If number of scopes increases, extra English letters are allowed to be used in the numbering system.

If new documentation forms will be established in any scope of application the serial number of a document increases.

If diverse forms of the same document are available, small Latin letters (a, b, c, d, e…) may be used following the numeral row on user’s demand. At the same time the original document remains valid.

Account number for a blank publication should be printed top right on a cover and top page of a log (blank).

If similar blank publication of other countries’ Hydrographic Offices is available, it is necessary to point out its catalogue number in brackets and country’s international code, e.g. AN-3 (CHO-3RU).